CVE-2026-82757: Ash-Project Ash Authentication OAUTH2 Server

Medium severity, CVSS 6.3. EPSS: 0.7% chance of exploitation in the next 30 days.

Server-Side Request Forgery (SSRF) vulnerability in ash-project ash_authentication_oauth2_server allows an attacker who controls a client metadata URL and its DNS to make the server connect to internal or loopback addresses. public_ip?/1 in AshAuthentication.Oauth2Server.CIMD.ReqFetcher enforces the outbound policy for CIMD metadata fetches. It classified several address forms as publicly routable that are not: IPv4-compatible ::/96 (for example ::127.0.0.1), SIIT IPv4-translated ::ffff:0:0:0/96, and deprecated site-local fec0::/10. A returned AAAA record in one of these ranges passed the policy, so a fetch pinned to that address reached space the policy was meant to block. This issue affects ash_authentication_oauth2_server: from 0.3.0 before 0.3.1.

Affected products

• Ash-Project Ash Authentication OAUTH2 Server: from 0.3.0, before 0.3.1 (fixed in 0.3.1)

Published 2026-09-07. Last modified 2026-09-08.